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Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

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copper, zinc), the importance <strong>of</strong> considering the toxicity <strong>of</strong> metal mixtures is also discussed.<br />

Finally, some issues related to background Pb concentrations are briefly addressed. It is beyond<br />

the scope <strong>of</strong> this section to review all methodologies in aquatic system research, but good<br />

reviews can be found in summary books, such as Rand et al. (1995).<br />

AX7.2.1.1 Analytical Methods<br />

Common analytical methods <strong>for</strong> measuring Pb in the aquatic environment are summarized<br />

in Table AX7-2.1.1. For relevance to the ambient water quality criteria (AWQC) and sediment<br />

quality criteria <strong>for</strong> Pb discussed below, minimum detection limits should be in the low parts per<br />

billion (ppb) range <strong>for</strong> surface water and the low parts per million (ppm) range <strong>for</strong> sediment.<br />

Table AX7-2.1.1. Common Analytical Methods <strong>for</strong> Measuring <strong>Lead</strong> in Water,<br />

Sediment, and Tissue<br />

Analysis Type Analytical Method<br />

Direct-Aspiration (Flame) Atomic Absorption Spectroscopy<br />

(AAS)<br />

Graphite Furnace Atomic Absorption Spectroscopy<br />

(GFAAS)<br />

Inductively Coupled Plasma<br />

(ICP)<br />

Inductively Coupled Plasma-Mass Spectrometry<br />

(ICP-MS)<br />

AX7-107<br />

<strong>EPA</strong> SW-846 Method 7420 a ,<br />

<strong>EPA</strong> Method 239.1 b ,<br />

Standard Method 3111 c<br />

<strong>EPA</strong> SW-846 Method 7421 a ,<br />

<strong>EPA</strong> Method 239.2 b ,<br />

Standard Method 3113 c<br />

<strong>EPA</strong> SW-846 Method 6010B a ,<br />

<strong>EPA</strong> Method 200.7 b ,<br />

Standard Method 3120 c<br />

<strong>EPA</strong> SW-846 Method 6020 a ,<br />

<strong>EPA</strong> Method 200.8 b<br />

a U.S. Environmental Protection Agency (1986c) Test Methods <strong>for</strong> Evaluating Solid Waste, Physical/Chemical<br />

Methods (SW-846). Third Edition, September 1986; Final Updates I (7/92), <strong>II</strong>A (8/93), <strong>II</strong> (9/94), <strong>II</strong>B (1/95),<br />

<strong>II</strong>I (12/96), <strong>II</strong>IA (4/98), <strong>II</strong>IB (11/04).<br />

b U.S. Environmental Protection Agency (1991) Methods <strong>for</strong> the Determination <strong>of</strong> Metals in Environmental<br />

Samples. <strong>EPA</strong>/600/4-91-010. June 1991 (Supplement I, <strong>EPA</strong>/600/R-94-111, May 1994).<br />

c American Public Health Association (1995) Standard Methods <strong>for</strong> the Examination <strong>of</strong> Water and Wastewater,<br />

19th Edition. American Public Health Association, American Water Works Association, Water Pollution<br />

Control Federation.<br />

In addition to the methods presented in Table AX7-2.1.1, many <strong>of</strong> the methods discussed<br />

in Section AX7.1.1 can be applied to suspended solids and sediments collected from aquatic

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